Creates an empty WebGLProgram object to which vector and fragment WebGLShader objects can be bound.

Returns an empty vertex or fragment shader object based on the type specified.

Sets whether or not you can write to the depth buffer.

Render geometric primitives from bound and enabled vertex data.

Renders geometric primitives indexed by element array data.

Turns on a vertex attribute at a specific index position in a vertex attribute array.

结束绘制, 每绘制完一个元素都要偏移一下光标

Returns a value for the WebGL error flag and clears the flag.

Returns information about the last error that occurred during the failed linking or validation of a WebGL program object.

Returns errors which occur when compiling a shader.

Links an attached vertex shader and an attached fragment shader to a program so it can be used by the graphics processing unit (GPU).

func (c *Context) SampleCoverage(value float64, invert bool) { c.Call("sampleCoverage", value, invert) } Sets the dimensions of the scissor box.

Sets and replaces shader source code in a shader object.

return texture id

public function stencilFunc(func:GLenum, ref:GLint, mask:GLuint) : Void; public function stencilFuncSeparate(face:GLenum, func:GLenum, ref:GLint, mask

Replaces a portion of an existing 2D texture image with all of another image.

Assigns a floating point value to a uniform variable for the current program object.

Assigns a floating point value to a uniform variable for the current program object.

Assigns a integer value to a uniform variable for the current program object.

Assigns 2 floating point values to a uniform variable for the current program object.

Assigns 3 floating point values to a uniform variable for the current program object.

Assigns 4 floating point values to a uniform variable for the current program object.

Sets values for a 3x3 floating point vector matrix into a uniform location as a matrix or a matrix array.

AllocIndexBuffer alloc a new Index-Buffer, Return the resource handler.

Swap erase the TransformComp if exist Delete will unlink the parent-child relation

绘制元素, bb 存储相对于父容器的相对坐标..

Returns a WebGLUniformLocation object for the location of a uniform variable within a WebGLProgram object.

Resize...

此处圆角的算法： 使用一个12边形近似圆形，采用中心放射算法，计算出 各个角度的sin/cos, 然后通过公式，得到圆圆形顶点 f(x) = centre.x + cos()*radius f(y) = centre.y + sin()*radius 以上, 可以提前算好 sin/cos 加速整个过

reset frame-buffer size

更新 Button 状态.... TODO 此处的输入状态，更新有bug！！

AllocShader compile and link the Shader source code, Return the resource handler.

AllocTexture upload image to GPU, Return the resource handler.

AllocVertexBuffer alloc a new Vertex-Buffer, Return the resource handler.

Proxy the OnComplete method. proxyAnimator uses the CompleteCallback to remove itself from the TweenEngine, the user CompleteCallback will be called a

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